Theoretical study of a W-band-covering frequency tunable gyrotron

Fanhong Li; Chao-hai Du; Zi-chao Gao; Shi Pan; Liang Zhang; Pu-kun Liu; K. Ronald; Adrian W. Cross

doi:10.1109/TED.2019.2957040

Theoretical study of a W-band-covering frequency tunable gyrotron

Fanhong Li, Chao-hai Du, Zi-chao Gao, Shi Pan, Liang Zhang, Pu-kun Liu, K. Ronald, Adrian W. Cross

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Abstract

The gyrotron has already demonstrated the capability of generating high-power coherent electromagnetic (EM) radiation at high frequencies and finds application in fusion plasma heating and magnetic resonance spectroscopy. In this article, we propose a W-band gyrotron, which uses a so-called multimode switching scheme to realize ultrabroadband frequency tuning capability, nearly covering about 70% of the W-band (75-110 GHz) range. The tuning strategy used to suppress mode competition and stabilize gun parameters in such an open-cavity multimode switching gyrotron is presented. Theoretical study shows that the multimode switching gyrotron can generate a frequency tuning range much wider than a conventional step-tuning gyrotron or a single-mode tuning gyrotron. In addition, another technology that uses a slot-assisted circuit to select only axis-symmetrical TE operating modes is presented. Using such a circuit, a tuning range of about 25 GHz in the W-band is obtainable. The proposed multimode switching gyrotron is a promising ultrabroadband source for millimeter-wave and terahertz-wave applications.

Original language	English
Article number	8945210
Pages (from-to)	659-666
Number of pages	8
Journal	IEEE Transactions on Electron Devices
Volume	67
Issue number	2
Early online date	30 Dec 2019
DOIs	https://doi.org/10.1109/TED.2019.2957040
Publication status	Published - 29 Feb 2020

Keywords

frequency tunable gyrotron
W-band
coherent electromagnetic (EM) radiation
broadband tuning

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10.1109/TED.2019.2957040

Li-etal-ITED2019-Theoretical-study-W-band-covering-frequency-tunable-gyrotronAccepted author manuscript, 829 KB

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Projects

1 Active

Terahertz High-Harmonic Gyrotron Oscillator By Using Metasurface Cylindrical Cavity (Newton Advanced Fellowship - Prof Chao-Hai Du)

Cross, A. & Zhang, L.

Royal Society

28/03/18 → 27/03/21

Project: Research Fellowship

Cite this

Li, F., Du, C., Gao, Z., Pan, S., Zhang, L., Liu, P., ... Cross, A. W. (2020). Theoretical study of a W-band-covering frequency tunable gyrotron. IEEE Transactions on Electron Devices, 67(2), 659-666. [8945210]. https://doi.org/10.1109/TED.2019.2957040

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abstract = "The gyrotron has already demonstrated the capability of generating high-power coherent electromagnetic (EM) radiation at high frequencies and finds application in fusion plasma heating and magnetic resonance spectroscopy. In this article, we propose a W-band gyrotron, which uses a so-called multimode switching scheme to realize ultrabroadband frequency tuning capability, nearly covering about 70{\%} of the W-band (75-110 GHz) range. The tuning strategy used to suppress mode competition and stabilize gun parameters in such an open-cavity multimode switching gyrotron is presented. Theoretical study shows that the multimode switching gyrotron can generate a frequency tuning range much wider than a conventional step-tuning gyrotron or a single-mode tuning gyrotron. In addition, another technology that uses a slot-assisted circuit to select only axis-symmetrical TE operating modes is presented. Using such a circuit, a tuning range of about 25 GHz in the W-band is obtainable. The proposed multimode switching gyrotron is a promising ultrabroadband source for millimeter-wave and terahertz-wave applications.",

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